• Speech Sciences
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• v.12 no.4
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• pp.77-92
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• 2005

Voice is made by systemic interaction of respiration, vocalization, articulation and resonation. There is no existing multi-channel voice analysis system to assess voice and respiration simultaneously. The most existing systems consist of. vocal fold vibration measurement such as stroboscopy, EGG (electroglottography) or laryngeal electromyography and voice analysis system. Since respiration has close relationship with voice simultaneous analysis of both vocal cord vibration and respiration are essential. In this study, a four channel integrated system are developed for acoustic analysis through microphone, vocal fold vibratory analysis using EGG, and respiratory analysis using two channel RIP (respiratory inductive plethysmography).

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.11a
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• pp.410-413
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• 2001

In this paper, we present results of this that design of the multi-layer VCO(Voltage Controlled Oscillator), which is composed of the resonation circuit and the oscillation circuit, using EM simulator and nonlinear RF circuit simulator. EM simulator is used for acquiring EM(Electromagnetic) characteristics of conductor pattern as well as designing multi-layer VCO, Acquired EM characteristics of the circuit pattern was used like real components at nonlinear RF circuit simulator. Finally VCO is simulated at nonlinear RF circuit simulator. The material for the circuit pattern was Ag and the dielectric was Dupont ＃9599, which is applied for LTCC process. The structure is constructed with 4 conducting layer. Simulated results showed that the output level was about 1[dBm], the phase noise was 102 [dBc/Hz] at 30[kHz] offset frequency, the harmonics -8dBc, and the control voltage sensitivity of 30[MHz/V] with a DC current consumption of 10[mA].

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.11a
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• pp.275-278
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• 2003

The aim of the study is to scrutinize the relationship between the area of resonance and center frequency with varying thickness by analyzing the characteristics of 2-port resonator. This was done through ideal design using Leach model equivalent model modified Mason model equivalent circuit for the application of bandpass filter high-frequency band with resonator Moreover, through the design of ladder-type BPF, we were able to observe changes in bandwidth, resonation, out-of-band rejection depending on the number and area of resonator.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.7
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• pp.1326-1331
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• 2001

This paper has been studied about design of a transceiver for data transmission. The transceiver has bandwidth of 424.7~424.95 MHz and uses half duplex communication method, PLL synthesized, 20 channel, 12.5 KHz channel bandwidth and FSK modulation/demodulation method. The transmission set is designed using low noise amplifier and power amplifier Also, it consists of low pass filter and resonation circuit for decrease of spurious signal. The receiver set is designed using dual conversion method. Finally, the transceiver set achieves the following characteristics 9.71dbm output power, 47dbc spurious property and $\pm$12.3 Jitter at sensitivity of -1134dbm.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.15 no.5
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• pp.412-418
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• 2002

In this paper, the authors present the simulation results and the experimental considerations on the effects of the effects of the VCO oscillation characteristics caused by varying the length of the MSL and the composition capacitance of LC resonation circuity. Simulation was accomplished by nonlinear RF circuit simulator for designing and analyzing the RF characteristis of VCO. The samples with 3 different MSL lengths of which the length is 140mil, 280mil and 560mil respectively were fabricated by screen printing process. The oscillation frequency of each sample(VCO) was tuned to UHF band (750MHz~900MHz) by varying the capacitance of LC resonator circuit. The experimental results showed that the values of phase noise were -82, -93, -97[dBc/Hz] at 50[kHz] offset frequency, the pushing figures were 114, 94, 318[kHz] at applied voltage of $3\pm0.15$[V] and the harmonics were -21, -16, -13[dBc] for MSL lengths of 140mil 280mil, 560mil respectively. The frequency and output variation width were 779~898[MHz], -36~-33[dBm] for MSL with 140mil length; 818~836[MHz], -27.19~27.06[dBm] for 280mil; 751.54~751.198[MHz], -33.44~-33.31[dBm] for 560mil.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.6 no.1
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• pp.46-55
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• 1995

Authors devised an objective test for nasal resonatory disorders using a vibratory sensor(Piezoelectric receiver) which is relatively cheap. The vibratory sensor was covered with duralumin to eliminate contamination of acoustic sound except a small hole which is attached on ala nasi during the test. Electrical signals front the vibratory sensor and the microphone while the subject is phonating vowel/a/ and nasal consonant /ng/ and phonating 8 syllable sentence /papa/ passage and /mama/ passage were digitized with n 12 bit A/D converter. For the evaluation of the hypernasality, the ratio of /ng/ to /a/ and /mama/ passage to /papa/ passage were used instead of individual values to reduce the observational error. For the evaluation of the hyponasality, the cul-de-sac resonation was induced by obstructing the nasal aperture of the ipsilateral side with the finger. In the normal control group, the ratio of /ng/ to /a/ and /mama/ passage to /papa/ passage was larger than 8. In the hypernasality with nasal emission group. the ratio was decreased markedly(p＜0.01). When the nasal aperture was obstructed with the finger, the vibratory signals of /a/ and /ng/ were increased markedly in the control group and hypernasality group(p＜0.01). However, in the hyponasality group(severe), the increment was minimal. So this system can be used to detect the nasal resonatory disorders objectively and differentiate the hypernasality front hyponasality easily.

• Journal of the Korean Ceramic Society
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• v.39 no.3
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• pp.265-271
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• 2002

Density, water resistance, Raman and infrared spectroscopy were used to investigate the change of structural characteristics with the composition of phosphate galss samples made by melting method. The structural abnormality of the density and water resistance were rapidly increased and shown near the 60mol% of $P_2O_5$. This result could be explained by the structural changes owing to the strong shrinkage of glass network by the coordination of DBO(Double-Bonded Oxygen) around $Mg^{2+}$ cations. In addition, it seems that the DBOs coordinating $Mg^{2+}$ cations lose its characteristics of double bonding and resonate with other NBOs(Non-Bonding Oxygen).

• The Journal of the Korea Contents Association
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• v.4 no.2
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• pp.68-75
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• 2004

In this paper, n study a distributed establishment scheme to setup lightpath in WDM/TDM Network considering user traffic characteristics. We propose a GBTA(guaranteed-bandwidth time-slot allocation) algorithm which assigns time-slots according to the requred traffic so that it can utilize given network resources efficiently in RWTA(routing and wavelength time-slot assignment) schemes. We consider traffic specification on the basis of ATM traffic classes. Also, in order to increase link utilization and minimize blocking probability, we extend distributed lightpath establishment protocol based on GBTA algorithm. In order to establish lightpath in distributed WDM/IDM network, we use backward resonation protocol that resewes resource with recent information. We use DOWTns(Distributed Optical WDM/TDM ns) that is extended from NS(Network Simulator), in order to verify proposed GBTA-based optical wavelength routed network.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.05a
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• pp.132-132
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• 2001

본 논문에서는 혼합예약요청(hybrid reservation request) 알고리즘을 적용한 새로운 동적 예약 TDMA 프로토콜을 제안한다. 제안된 혼합 예약 요청 알고리즘은 기존의 랜덤접속방식과 기지국의 중재 없이 단말간 직접 신호교환을 통하여 이웃 단말의 새로운 예약 요청을 대신 전송하는 방식을 혼합해서 사용하는 방법이다. 이 알고리즘은 기존 slotted-ALOHA 방식을 이용한 예약 요청의 비효율성을 개선하여 새로운 단말의 예약 요청실패로 인한 셀 전송지연 및 호 봉쇄 확률(call blocking probability)을 줄이기 위한 목적으로 제안되었다. 제안한 알고리즘은 새로 전송할 데이터를 가진 단말이 많은 경우에 특히 효율적이다. 본 논문에서 제안하는 프로토콜은 모든 종류의 트래픽이 예약을 통한 전송방식으로 전송된다. 즉, 단말들로부터의 예약 요청을 바탕으로, 기지국이 스케줄링을 하여 트래픽 별로 접근 슬랏을 할당해 주는 방식이다. 이 경우, 예약 요청을 하는 방법은 새로 전송을 개시하는 단말과 이미 전송중인 단말의 경우가 다른데, 새로운 전송을 위한 예약이 필요한 단말은 제안하는 알고리즘을 이용하며, 이미 예약에 성공한 단말은 기존에 사용하던 자신의 버스트헤더(burst header)에 피기백(piggybacking)하는 방법을 이용한다. 제안한 알고리즘에 따라, 새로 접속하는 단말이나 새로운 예약 요청이 필요한 단말은 두 단계로 요청을 전송할 수 있다. 첫 번째 단계는 이미 예약에 성공하여 전송중인 이웃단말에게 전송요청신호를 보내 간접적으로 기지국에게 예약을 요청하는 방법이며, 두 번째 단계는 첫 번째 방법이 실패했을 경우 기존의 랜덤접속방법에 참가하는 것이다 먼저 첫 번째 방법에서는 단말이 랜덤접근 구간의 예약요청구간(resonation request)중 하나의 미니 슬랏을 선택해 이웃 단말들에게 한번 방송(broadcast) 한다 이후 ACK 응답구간(ACK receive)에서 응답을 받으면 예약요청성공이라 간주하고, 그렇지 않으면 실패로 판단, 뒤이어 오는 랜덤접근구간(normal random access period)에 참가하여 기지국에게 직접 예약 요청을 한다. 시뮬레이션은 기존 slotted-ALOHA방식으로 랜덤 접속을 할 경우와 제안한 방식과의 성공률을 비교해 제안한 방식의 call blocking probability가 낮음을 보였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.12
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• pp.171-176
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• 2005

This study designed and fabricated a multi-purpose planar antenna for base stations that are accessible to DCS, WiBro, and ISM. The proposed antenna was designed into an open loop form from the existing monopole structure. The capacitance of the multi-purpose antenna was increased by the coupling of open parts. This makes the use of MMIC and LTCC convenient and the antenna is smaller and has a larger gain than existing antennas. The resonance distance and bandwidth can be adjusted by changing the open gap and the height of the loop of the antenna. The bandwidth of the designed antenna satisfies DCS, IMT-2000, WiBro, Bluetooth, wireless LAN and ISM bands based on VSWR 2. The entire frequency bandwidth is $58.75\%$ of $1.575GHz\~2.985GHz(1.41GHz)$. Also, the radiation pattern of the antenna displayed co-polarization and cross-polarization characteristics at 1.6GHz, 2.3GHz and 2.8GHz.